599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394

Modify Registry

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exespoolsv.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "mspri32.exe"	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\StubPath = "mspri32.exe"	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Active Setup\Installed Components\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

Executes dropped EXE 1 IoCs

Processes:

spoolsv.exe

pid process

2276 spoolsv.exe

pid	process
2276	spoolsv.exe

Modifies system executable filetype association 2 TTPs 2 IoCs

persistence

Modify Registry

Change Default File Association

T1546.001

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exespoolsv.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	spoolsv.exe

UPX packed file 5 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral1/memory/2760-0-0x0000000000400000-0x0000000000439000-memory.dmp	upx
C:\Windows\SysWOW64\concp32.exe	upx
C:\Windows\spoolsv.exe	upx
behavioral1/memory/2760-14-0x0000000000400000-0x0000000000439000-memory.dmp	upx
behavioral1/memory/2276-15-0x0000000000400000-0x0000000000439000-memory.dmp	upx

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exespoolsv.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	spoolsv.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2248906074-2862704502-246302768-1000\Software\Microsoft\Windows\CurrentVersion\Run\VCL = "vcl32.exe"	spoolsv.exe

Drops file in System32 directory 6 IoCs

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

description	ioc	process
File created	C:\Windows\SysWOW64\vcl32.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
File opened for modification	C:\Windows\SysWOW64\vcl32.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
File created	C:\Windows\SysWOW64\mspri32.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
File opened for modification	C:\Windows\SysWOW64\mspri32.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
File created	C:\Windows\SysWOW64\concp32.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
File opened for modification	C:\Windows\SysWOW64\concp32.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

Drops file in Windows directory 2 IoCs

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

description	ioc	process
File created	C:\Windows\spoolsv.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
File opened for modification	C:\Windows\spoolsv.exe	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

Modifies registry class 12 IoCs

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exespoolsv.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\sm = 01b8ec350471bd332433eee476ebe1f3	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\u2 = a54a6b702f92fdf2acd57599e2ae1608015dff41aa020117fc9bd8e2dcf4340f3fa61eb55d6f28597df90602703809d4	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\exefile\shell\open\command\ = "C:\\Windows\\SysWow64\\concp32.exe \"%1\" %*"	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\ax = 1ab2f0fb885036cb8a5cdaf35fcdba03	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}	spoolsv.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\InprocServer32	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\u0 = 658663d26f8bad325217a06063847056939f558d910ed252e05dd0113550f7fc0f4da82ff73a0681ba604c2d4f23269f	spoolsv.exe
Set value (data)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\u1 = 551d2e0658054ba756fd3798fea5ffca42865cb762a31639dabd7f2cca44e226	spoolsv.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID\{FA3558BE-8B9A-11D5-EBA1-F78EEEEEE983}\v = "165"	spoolsv.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

pid process

2760 599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

pid	process
2760	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

Suspicious use of WriteProcessMemory 4 IoCs

Processes:

599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe

description	pid	process	target process
PID 2760 wrote to memory of 2276	2760	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe	spoolsv.exe
PID 2760 wrote to memory of 2276	2760	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe	spoolsv.exe
PID 2760 wrote to memory of 2276	2760	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe	spoolsv.exe
PID 2760 wrote to memory of 2276	2760	599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe	spoolsv.exe

C:\Users\Admin\AppData\Local\Temp\599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe
"C:\Users\Admin\AppData\Local\Temp\599e153617b29456ad646496e8bd26261ae90534b96510179bd1b91167402394.exe"
1⤵
- Modifies Installed Components in the registry
- Modifies system executable filetype association
- Adds Run key to start application
- Drops file in System32 directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of WriteProcessMemory
PID:2760
- C:\Windows\spoolsv.exe
  C:\Windows\spoolsv.exe
  2⤵
  - Modifies Installed Components in the registry
  - Executes dropped EXE
  - Modifies system executable filetype association
  - Adds Run key to start application
  - Modifies registry class
  PID:2276

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

Event Triggered Execution

T1546

Change Default File Association

T1546.001

Defense Evasion

Modify Registry

3